linux-kernel - Re: [PATCH] net: phy: add qca8081 ethernet phy driver

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Message-ID: <20210817143226.GL22278@shell.armlinux.org.uk>
Date:   Tue, 17 Aug 2021 15:32:26 +0100
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Jie Luo <luoj@...eaurora.org>
Cc:     Andrew Lunn <andrew@...n.ch>, hkallweit1@...il.com,
        davem@...emloft.net, kuba@...nel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, sricharan@...eaurora.org
Subject: Re: [PATCH] net: phy: add qca8081 ethernet phy driver

On Tue, Aug 17, 2021 at 09:10:44PM +0800, Jie Luo wrote:
> 
> On 8/16/2021 9:56 PM, Andrew Lunn wrote:
> > On Mon, Aug 16, 2021 at 07:34:40PM +0800, Luo Jie wrote:
> > > qca8081 is industry’s lowest cost and power 1-port 2.5G/1G Ethernet PHY
> > > chip, which implements SGMII/SGMII+ for interface to SoC.
> > Hi Luo
> > 
> > No Marketing claims in the commit message please. Even if it is
> > correct now, it will soon be wrong with newer generations of
> > devices.
> > 
> > And what is SGMII+? Please reference a document. Is it actually
> > 2500BaseX?
> 
> Hi Andrew,
> 
> thanks for the comments, will remove the claims in the next patch.
> 
> SGMII+ is for 2500BaseX, which is same as SGMII, but the clock frequency of
> SGMII+ is 2.5 times SGMII.

Bah. Sounds like more industry wide misunderstanding of what SGMII
vs 1000Base-X is to me... or just plain abuse of the term "SGMII"!

I think you'll find that "SGMII+" is nothing but a term Qualcomm use
to refer to 2500BASE-X without the 16-bit in-band control word to
the host.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!